Bachelorette (/ˌbætʃələˈrɛt/)[1] is a term used in American English for a single, unmarried woman.
The term is derived from the word bachelor, and is often used by journalists, editors of popular magazines, and some individuals.
In older English, the female counterpart term to "bachelor" was "spinster".
However, this has acquired negative connotations and, when used now, tends to imply that the unmarried woman is too old to find a husband and have children.
However, in American English the -ess suffix is only marginally morphologically productive, and the -ette suffix can indicate a feminine version of a noun without a change in size (though many such words in -ette were intended to be jocular when they were first coined).